Spindle-drive.



No. 851,728. PATENTED APR. 30, 1907. W. J. BAYRER.

SP LE .DR APPLIOAT 11.111) s UNITED s'r rEs PATENT OFFICE.

WILLIAM J. BAYRER, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE HENRY & WRIGHT MANUFACTURING COMPANY, 'OF HARTFORD, CON- NECTICUT, A CORPORATION OF CONNECTICUT.

SPINDLE-DRIVE.

Specification of Letters Patent.

:atentea Apri, 30, 1907.

To all whom it "way, concern:

Be it known that I, WILLIAM J. BAYRER, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented a new and useful Spindle-Drive, =of which the following is a specification.

This invention relates t o a means for connecting a pulley or gear and a rotary and reciprocatory spindle or shaft. This means is useful for connecting any class of pulley or gear with any kind of vertical or horizontal shaft or spindle so that one part will be rotated by the rotationof the other part but one may be freely moved axially of the other. The invention, however, is. particularly adapted for connecting a driving pulley with the drill spindle of a drill press and is, therefore, illustrated and described herein as designed for such use.

The object of the invention is to provide a sim 1e and strongmeans for connecting a p ey or ear with a rotatory and reciprocatory spinc e or shaft in such manner that the spindle or shaft will be positively rotated but may be reciprocated very freely even though the torsional strain between the parts is great.

In the forms of the invention illustrated the pulley bushing has one, two or three longitudinally extending endless channels containing balls and the spindle has a corresponding number of longitudinally extending grooves into which portions of some of'the balls reject so as to lock the parts together rotari y but permit free longitudinal movement of the spindle.

Figure 1 of the accompanying drawings shows a side elevation of the column of a drill press supporting a spindle that is connected with the pulley by one of these drives. Fig. 2 shows a side elevaton. of a portion of the spindle and the pulley bushing with part of the latter cut away to expose the interior. Fig. 3 shows a section of the spindle and pulley bushing on the plane indicated by the line 33 on Fig. 2. Fig. 4 is a plan showing a modified form of the same. And Fig. 5 shows a similar view of another modification.

The driving pulley 1 may be a simple pulley or acone pulley having any number of steps and the spindle 2 may be any diameter and length and may be raised and lowered in the usualway.

The spindle may have one, two, three or more, but preferably three, semi-circular grooves, 3, extending-parallel with its axis.

The bushing 4 of any suitable length and diameter, that is located in and preferably keyed to the hub of the pulley has one, two, three or.more, channels 5. These channels of course correspond in size and number with those in the spindle. Caps 6 with curved bushing and preferably fastened in place by screws 8 so as to make the channels continuous. These channels are so made that when ways and these ways are filled with balls 10. The channels are so arranged that when the bushing or hub of the; pulley of which it spindle the inner rows of balls project into the lon itudinal grooves in the spindle and spline the parts together. Fig. 3 of the drawings shows three sets 0 balls; Fig. 4, two sets, and Fig. 5 one set. The number of sets of balls used dc ends upon the amount of strain that the ba ls are to be subjected to but it is preferred to use three sets of balls, for in that casethe balls not only strongly hold the parts together rotarily and allow free reciprocation of the spindle but also serve to hold the spindle against any sidewise movement. This allows the fit between the interior of the bushing or pulley hub to be loose, thus reducing friction and saving labor in manufacture.

The invention is adapted to a split pulley hub as is shown in Fig. 4. In this case parts of the channel may be milled in each face of the split hub and the balls inserted before the halves are put together and fastened.

When a drill spindle and its driving pulley are connected after the manner of this inven tion, the spindle may be equally well rotated in either direction by the rotation of the pulley and the spindle may be moved longi- 'reat torsional strain, as when holding a drill thatis being used to drill a lar e hole.

The splining part is usually ma e long so the parts are put together they form endless practically forms a part is applied 'to the tudinally very easily even if subjected to grooves 7 .are placed over tne ends of the ICC .that the connection is firm and the posts that when fine threads are being cut the threads are stripped and the work ruined. With the construction which forms the subject of this invention the torsional friction is so slight that it is negligible.

The invention claimed is l. The combination of a rotatory and reciprocatory spindle having grooves extending in straight lines parallel with its axis, means for rotating and reciprocating the spindle, a bushing in the hub of the rotating means and ing in straight lines paralle with its axis,

spindle, a bushing means and having endless channels, balls occupying the channels in the bushing and projecting into the grooves and caps fastened to the ends of the bushing specified. v

VVILLIAM J. BAYRER.

Witnesses:

ETIIEL M. LOWE, HARRY R.- WILLIAMS.

means for rotating and reciprocating theinthe hub of the rotating 30 in the spindle and closing the channels, substantially as 

